WELD-2755 Remove usage of ThreadGroup from Weld executors #1147

Job	Run time
Initial JDK 11 Weld Build + WildFly patch	9m 31s
Initial JDK 11 Weld Build + WildFly patch	9m 31s
CDI TCK - JDK 11	14m 21s
CDI TCK - JDK 11	14m 21s
Weld In-container Tests - JDK 11	8m 24s
Weld In-container Tests - JDK 11	8m 24s
Weld Examples build and test - JDK 11}	2m 37s
Weld Examples build and test - JDK 11}	2m 37s
CDI TCK - JDK 17	13m 11s
CDI TCK - JDK 17	13m 11s
Weld In-container Tests - JDK 17	5m 1s
Weld In-container Tests - JDK 17	10m 26s
CDI TCK SE - JDK 11	3m 26s
CDI TCK SE - JDK 11	3m 26s
CDI TCK SE - JDK 17	1m 22s
CDI TCK SE - JDK 17	1m 22s
Weld Tests w/o Container - JDK 11	4m 40s
Weld Tests w/o Container - JDK 11	4m 40s
Weld SE-Servlet Cooperation	43s
Weld SE-Servlet Cooperation	43s
Weld Tests w/o Container - JDK 17	4m 40s
Weld Tests w/o Container - JDK 17	4m 40s
Relaxed mode testing - JDK 11	18m 52s
Relaxed mode testing - JDK 11	18m 52s
	2h 59m 1s

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